Here are patches
I wrote with Max/Msp for different uses. These programs
are donationware (pyrolator@paypal.com).
I would be happy if you send a contribution, if you like the
applications and if you use it.

the last
plugin
You wish to add an AU/VST plugin behind iTunes, or as the last step
(like ARC) before your soundcard or you internal speakers. "The last
plugin" is made for that reason. Go to your Audio-Midi-Setup and use
"Soundflower" (http://cycling74.com/soundflower-landing-page/) to
route your Audio into "The Last Plugin".